I have used AVG antivirus for the past 3 years and no issues with it. It also happens to be free. Avg also has an antispyware that seems to work but after a month or so you need to update it manually. I operate behind a router and use Windows Defender-(also free..hmmm,maybe I am a cheap dude) I bought System Mechanic to do the clean ups and so far no complaints with it at all. It also has a system guard that does not seem to interfere with anything like Norton used to do to me. I HATED NORTON-slowed me down,always popping something or another up..And its a PITA to get rid of it after you dont want it anymore.